He added: "There's a high likelihood this was an assault on the agents". The area surrounding where the attack occurred also indicated rocks were likely used as weapons.

Fox News said reports that the agents were shot were denied by the Federal Bureau of Investigation, which had taken over the hunt for the killers.

Customs officials would not say what type of activity the agents were responding to. He also said there were no signs of a stabbing. A Border Patrol agency news conference had been scheduled for Monday afternoon in Van Horn, but was postponed to Tuesday. He began following "footprints" on a trail when he was ambushed. "Agent Martinez's partner reported that they were both injured and in need of assistance".

Border Protection spokesman Carlos Diaz confirmed to The Associated Press in an email that the FBI was in charge of the investigation.

Terror designation a way to hike North Korea pressure
State Department now lists Sudan, Syria and Iran as nations that have "repeatedly provided support for acts of global terrorism". North Korea was on the terrorism blacklist for two decades after the 1987 bombing of a South Korean airliner killed 115 people.

Jana Novotna Dead: Wimbledon Champion Dies at 49
Czech star Karolina Pliskova, the former world number one and 2016 US Open finalist, also paid tribute to her fallen compatriot. She won three Olympic medals, securing a bronze in singles and silver in doubles with Helena Sukova in Atlanta in 1996.

Signals were false hope for Argentine Sub
An Argentine national flag hangs at the entrance of the Argentine Naval Base Mar del Plata, where the missing submarine is based. Argentine President Mauricio Macri met with family members there who anxiously waited for news about their loved ones.

Judd did not further comment on the second agent's condition.

Border Patrol records show that the agency's Big Bend sector, which includes the area where Sunday's attack took place, accounted for about 1 percent of the more than 61,000 apprehensions its agents made along the Southwest border between October 2016 and May 2017. The region's mountains make it a hard area for people to cross illegally into the USA from Mexico.

"On behalf of the quarter of a million front line officers and agents of DHS, my thoughts and prayers go out to the family and friends of Agent Martinez and to the agent who is in serious condition", Acting Secretary of Homeland Security Elaine Duke said in a statement. Martinez is the second agent to have died this year.

"Our prayers are with the families of this Border Patrol Agent who was killed & the other who was injured in this attack in Texas".

US President Donald Trump has repeated his call for building a wall on the border with Mexico as a US Border Patrol Agent died on Sunday after being injured while on duty.

President Donald Trump cited the incident as a reason why the United States needs to build a wall along the border with Mexico.